In this study, the performance of dielectric barrier discharge (DBD) with the aerated condition a... more In this study, the performance of dielectric barrier discharge (DBD) with the aerated condition at discharge voltages of 15, 20, and 25 kV on the production of biogas; CH4, H2, CO, and CO2 and the removal of COD and BOD from POME were investigated. The experimental results showed that the aerated condition with a rate of 2.5 L/min at a high voltage (25 kV) produced CH4, CO, and CO2 that was 9.4, 21.5, and 19.6 times higher than the non-aerated one, respectively. The maximum cumulative volume of CH4, H2, CO, and CO2 was 95.4 ± 8.92, 0.94 ± 0.71, 3.06 ± 0.73, and 2.45 ± 0.35 mL/mg COD, respectively, under the aerated condition at 25 kV and the experimental data fit well with the polynomial regression (R2 > 95) for the initial biogas production. The decrease in COD and BOD was greatly affected by the high discharge voltage under the aerated condition, resulting in a high removal rate. These findings suggest that good performance was observed when the DBD was integrated with the aera...
Journal of applied agricultural science and technology, Feb 28, 2022
Quicklime is a widely used industrial chemical and its characteristics may be affected by the lim... more Quicklime is a widely used industrial chemical and its characteristics may be affected by the limestone characteristics and calcination temperature. The present study investigated the quicklime characteristics obtained from limestone after calcination at different temperatures (800, 900, and 1000 ℃) from six geological-different mines in West Sumatera, Indonesia. X-ray fluorescence (XRF) analysis was performed to characterize the elemental compositions in limestone and quicklime. The stoichiometric evaluation was examined to compare the obtained carbon dioxide (CO2) from experimental and theoretical results during calcination. Based on elemental composition from XRF analysis, all the investigated limestones are very pure limestones, with impurities of less than 1%. The level of calcium oxide (CaO) after calcination at 1000℃ increased to more than 90% for all investigated limestone. The obtained CaO and CO2 mass after calcination at 1000℃ for 5 h were more than 70 and 60 grams, respectively. However, the experimental results on CaO and CO2 mass were 5-12% less than theoretical mass, reflecting the partial decomposition of calcium carbonate during the calcination process.
Rainwater is a potential source of drinking water, but has various components of dissolved organi... more Rainwater is a potential source of drinking water, but has various components of dissolved organic matter (DOM). DOM is a reservoir of potential hazards in drinking water. Therefore, a new method is required to purify rainwater as a drinking water source in terms of DOM aspects. A radio-frequency (RF) treatment system is introduced here to purify source water with a small possibility of contamination. RF is generated by applying a frequency of 1.5 MHz through a glass reactor with a diameter of 2 mm which is wrapped by a 2 mm copper wire. The results demonstrate that UV260 value and dissolved organic carbon (DOC) are reduced during RF treatment. DOC was reduced by a lower amount compared to UV260, suggesting the partial transformation of bio-refractory DOM. A fluorescence excitation-emission matrix showed that humic-like substances in rainwater were reduced faster than protein-like ones, indicating that humic-like substances are susceptible to reduction by RF treatment. The results o...
The recycling process is applied in many water treatment plants (WTPs), although this process can... more The recycling process is applied in many water treatment plants (WTPs), although this process can lead to adverse effects. The effect of the recycling process on the characteristics of dissolved organic matter was evaluated based on a fluorescence excitation-emission matrix using the peak-picking technique and self-organizing map (SOM). In this study, an evaluation of two WTPs, one with and one without a recycling system, was carried out. Both WTPs show moderate efficiency during the coagulation–flocculation process in removing DOC, fulvic acid-like, humic acid-like, and tryptophan-like substances. The recycling process causes increased values of fulvic acid-like, humic acid-like, and tryptophan-like substances and specific ultraviolet absorbance (SUVA) after the filtration process of about 31.0%, 35.7%, 22.2%, and 6%, respectively. Meanwhile, the WTP without recycling showed a reduction in the level of fulvic acid-like, humic acid-like, and tryptophan-like substances and SUVA by 23...
This research focuses on characterizing the dissolved organic matter found at water treatment pla... more This research focuses on characterizing the dissolved organic matter found at water treatment plants with closed systems. Recycled water generated as a by-product of water treatment is added to raw water in those systems. The dissolved organic matter in the raw water was found to be higher in summer than in winter, but the water treatment process was able to produce purified water of the similar quality in both seasons. The recycled water contained mostly low molecular weight and protein-like substances, and this composition was different from that of the raw water, which mainly contained humic-like substances. The recycled water did not influence the concentration of humic-like substances or the molecular weight distribution in the influent water. doi: 10.2166/ws.2020.117 ://iwaponline.com/ws/article-pdf/20/5/2013/729394/ws020052013.pdf Hudori Hudori (corresponding author) Yukitaka Suzuki Graduate School of Engineering, Gifu University, Gifu, 501-1193, Japan E-mail: hudori@uii.ac.i...
IOP Conference Series: Materials Science and Engineering, 2020
Indonesia has a large amount of rainfall and can be used as raw water of drinking water. A Radio ... more Indonesia has a large amount of rainfall and can be used as raw water of drinking water. A Radio frequencyplasma system radiation can produce active compounds (•OH-, •O, •H+, H2O2, O3 etc) in water, the active compounds have a high oxidation potential and can kill microorganisms present in water (fecal coliform, total coliform and Salmonella). Plasma system is one way to produce drinking water in terms of health aspects because in the process the tool does not contact with the material directly, so the possibility of contamination is small. The purpose of this study is to remove microorganisms in rainwater using plasma radio frequency system continuously. Samples will be filtered using pure and mix polypropylene cartridge filter with a pore size of 1 μm and then contact in plasma system. Plasma is generated by applying a frequency of 0,16 MHz through a glass reactor with a thickness of 2 mm which is wrapped by a 1 mm copper wire. The results show that the removal microorganism in ra...
Drinking water treatment sludge (DWTS) is a waste by-product from water treatment plants where al... more Drinking water treatment sludge (DWTS) is a waste by-product from water treatment plants where aluminum and iron salts are the most commonly used coagulants. DWTS was reused to investigate the effects of DWTS on the digestion liquid quality and microorganism activity of excess activated sludge (EAS). DWTS with four suspended solid (SS) concentrations (0%, 2%, 5% and 10%) was added to EAS which was sampled during aerobic and anaerobic digestion processes, then batch tests were carried out which followed the coagulation-flocculation process. It was found that DWTS can improve total dissolved nitrogen (TDN) and dissolved phosphorus (DP) removal efficiencies for anaerobic EAS. The highest removal efficiency of TDN (29.97%) as well as DP (55.38%) was observed when DWTS dosage was SS = 10%. The release of dissolved organic matter (DOM) by DWTS could increase dissolved organic carbon (DOC) concentration and lead to the accumulation of non-biodegradable humic acid-like substance in aerobic ...
The present study investigates the treatment of palm oil mill e uent (POME) with a dielectric bar... more The present study investigates the treatment of palm oil mill e uent (POME) with a dielectric barrier discharge (DBD) plasma system. This paper presents the results of the yield of hydrogen (H 2) and methane (CH 4), and the removal of organic matter and chemical oxygen demand (COD) from POME. Also, state-of-the-art methods were employed to measure methane and hydrogen directly from the reactor as well as their improvement. The DBD was carried out with an applied voltage of 10-25 kV in a batch glass plasma reactor. The results revealed a signi cant e ect of the voltage variation on the yield of H 2 and CH 4. Increasing the applied voltage enhanced the conversion of POME with COD reduction in the range of 48.9 to 53.7% and biochemical oxygen demand reduction in the range of 30 to 40% when the applied voltage was 15-25 kV. Furthermore, to estimate the removal of organic matter in POME, a uorescence excitation-emission matrix was used.
In this study, the performance of dielectric barrier discharge (DBD) with the aerated condition a... more In this study, the performance of dielectric barrier discharge (DBD) with the aerated condition at discharge voltages of 15, 20, and 25 kV on the production of biogas; CH4, H2, CO, and CO2 and the removal of COD and BOD from POME were investigated. The experimental results showed that the aerated condition with a rate of 2.5 L/min at a high voltage (25 kV) produced CH4, CO, and CO2 that was 9.4, 21.5, and 19.6 times higher than the non-aerated one, respectively. The maximum cumulative volume of CH4, H2, CO, and CO2 was 95.4 ± 8.92, 0.94 ± 0.71, 3.06 ± 0.73, and 2.45 ± 0.35 mL/mg COD, respectively, under the aerated condition at 25 kV and the experimental data fit well with the polynomial regression (R2 > 95) for the initial biogas production. The decrease in COD and BOD was greatly affected by the high discharge voltage under the aerated condition, resulting in a high removal rate. These findings suggest that good performance was observed when the DBD was integrated with the aera...
Journal of applied agricultural science and technology, Feb 28, 2022
Quicklime is a widely used industrial chemical and its characteristics may be affected by the lim... more Quicklime is a widely used industrial chemical and its characteristics may be affected by the limestone characteristics and calcination temperature. The present study investigated the quicklime characteristics obtained from limestone after calcination at different temperatures (800, 900, and 1000 ℃) from six geological-different mines in West Sumatera, Indonesia. X-ray fluorescence (XRF) analysis was performed to characterize the elemental compositions in limestone and quicklime. The stoichiometric evaluation was examined to compare the obtained carbon dioxide (CO2) from experimental and theoretical results during calcination. Based on elemental composition from XRF analysis, all the investigated limestones are very pure limestones, with impurities of less than 1%. The level of calcium oxide (CaO) after calcination at 1000℃ increased to more than 90% for all investigated limestone. The obtained CaO and CO2 mass after calcination at 1000℃ for 5 h were more than 70 and 60 grams, respectively. However, the experimental results on CaO and CO2 mass were 5-12% less than theoretical mass, reflecting the partial decomposition of calcium carbonate during the calcination process.
Rainwater is a potential source of drinking water, but has various components of dissolved organi... more Rainwater is a potential source of drinking water, but has various components of dissolved organic matter (DOM). DOM is a reservoir of potential hazards in drinking water. Therefore, a new method is required to purify rainwater as a drinking water source in terms of DOM aspects. A radio-frequency (RF) treatment system is introduced here to purify source water with a small possibility of contamination. RF is generated by applying a frequency of 1.5 MHz through a glass reactor with a diameter of 2 mm which is wrapped by a 2 mm copper wire. The results demonstrate that UV260 value and dissolved organic carbon (DOC) are reduced during RF treatment. DOC was reduced by a lower amount compared to UV260, suggesting the partial transformation of bio-refractory DOM. A fluorescence excitation-emission matrix showed that humic-like substances in rainwater were reduced faster than protein-like ones, indicating that humic-like substances are susceptible to reduction by RF treatment. The results o...
The recycling process is applied in many water treatment plants (WTPs), although this process can... more The recycling process is applied in many water treatment plants (WTPs), although this process can lead to adverse effects. The effect of the recycling process on the characteristics of dissolved organic matter was evaluated based on a fluorescence excitation-emission matrix using the peak-picking technique and self-organizing map (SOM). In this study, an evaluation of two WTPs, one with and one without a recycling system, was carried out. Both WTPs show moderate efficiency during the coagulation–flocculation process in removing DOC, fulvic acid-like, humic acid-like, and tryptophan-like substances. The recycling process causes increased values of fulvic acid-like, humic acid-like, and tryptophan-like substances and specific ultraviolet absorbance (SUVA) after the filtration process of about 31.0%, 35.7%, 22.2%, and 6%, respectively. Meanwhile, the WTP without recycling showed a reduction in the level of fulvic acid-like, humic acid-like, and tryptophan-like substances and SUVA by 23...
This research focuses on characterizing the dissolved organic matter found at water treatment pla... more This research focuses on characterizing the dissolved organic matter found at water treatment plants with closed systems. Recycled water generated as a by-product of water treatment is added to raw water in those systems. The dissolved organic matter in the raw water was found to be higher in summer than in winter, but the water treatment process was able to produce purified water of the similar quality in both seasons. The recycled water contained mostly low molecular weight and protein-like substances, and this composition was different from that of the raw water, which mainly contained humic-like substances. The recycled water did not influence the concentration of humic-like substances or the molecular weight distribution in the influent water. doi: 10.2166/ws.2020.117 ://iwaponline.com/ws/article-pdf/20/5/2013/729394/ws020052013.pdf Hudori Hudori (corresponding author) Yukitaka Suzuki Graduate School of Engineering, Gifu University, Gifu, 501-1193, Japan E-mail: hudori@uii.ac.i...
IOP Conference Series: Materials Science and Engineering, 2020
Indonesia has a large amount of rainfall and can be used as raw water of drinking water. A Radio ... more Indonesia has a large amount of rainfall and can be used as raw water of drinking water. A Radio frequencyplasma system radiation can produce active compounds (•OH-, •O, •H+, H2O2, O3 etc) in water, the active compounds have a high oxidation potential and can kill microorganisms present in water (fecal coliform, total coliform and Salmonella). Plasma system is one way to produce drinking water in terms of health aspects because in the process the tool does not contact with the material directly, so the possibility of contamination is small. The purpose of this study is to remove microorganisms in rainwater using plasma radio frequency system continuously. Samples will be filtered using pure and mix polypropylene cartridge filter with a pore size of 1 μm and then contact in plasma system. Plasma is generated by applying a frequency of 0,16 MHz through a glass reactor with a thickness of 2 mm which is wrapped by a 1 mm copper wire. The results show that the removal microorganism in ra...
Drinking water treatment sludge (DWTS) is a waste by-product from water treatment plants where al... more Drinking water treatment sludge (DWTS) is a waste by-product from water treatment plants where aluminum and iron salts are the most commonly used coagulants. DWTS was reused to investigate the effects of DWTS on the digestion liquid quality and microorganism activity of excess activated sludge (EAS). DWTS with four suspended solid (SS) concentrations (0%, 2%, 5% and 10%) was added to EAS which was sampled during aerobic and anaerobic digestion processes, then batch tests were carried out which followed the coagulation-flocculation process. It was found that DWTS can improve total dissolved nitrogen (TDN) and dissolved phosphorus (DP) removal efficiencies for anaerobic EAS. The highest removal efficiency of TDN (29.97%) as well as DP (55.38%) was observed when DWTS dosage was SS = 10%. The release of dissolved organic matter (DOM) by DWTS could increase dissolved organic carbon (DOC) concentration and lead to the accumulation of non-biodegradable humic acid-like substance in aerobic ...
The present study investigates the treatment of palm oil mill e uent (POME) with a dielectric bar... more The present study investigates the treatment of palm oil mill e uent (POME) with a dielectric barrier discharge (DBD) plasma system. This paper presents the results of the yield of hydrogen (H 2) and methane (CH 4), and the removal of organic matter and chemical oxygen demand (COD) from POME. Also, state-of-the-art methods were employed to measure methane and hydrogen directly from the reactor as well as their improvement. The DBD was carried out with an applied voltage of 10-25 kV in a batch glass plasma reactor. The results revealed a signi cant e ect of the voltage variation on the yield of H 2 and CH 4. Increasing the applied voltage enhanced the conversion of POME with COD reduction in the range of 48.9 to 53.7% and biochemical oxygen demand reduction in the range of 30 to 40% when the applied voltage was 15-25 kV. Furthermore, to estimate the removal of organic matter in POME, a uorescence excitation-emission matrix was used.
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